export default {
  bind(el, binding, vnode, oldVnode) {
    let resizeEvent = new CustomEvent('drag-resize',{detail:'尺寸变化',bubbles:false});
    //初始化不最大化
    el.fullscreen = false;
    //弹框可拉伸最小宽高
    let minWidth = 400;
    let minHeight = 300;
    //当前宽高
    let nowWidth = minWidth;
    let nowHight = minHeight;
    //当前顶部高度
    let nowMarginTop = 0;
    //获取弹框头部（这部分可双击全屏）
    const dialogHeaderEl = el.querySelector('.el-dialog__header');
    let hasSetBodyHight = false;
    //弹窗
    const dragDom = el.querySelector('.el-dialog');

    dragDom.className += ' el-drag-dialog';
    //清除选择头部文字效果
    dialogHeaderEl.onselectstart = new Function("return false");
    //头部加上可拖动cursor
    dialogHeaderEl.style.cursor = 'move';

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

    //头部插入最大化最小化元素
    let maxMin = document.createElement("button");
    maxMin.className += ' el-dialog__headerbtn el-dialog__minmax';
    maxMin.style.right = '43px';
    maxMin.style.color = '#000';
    maxMin.title = el.fullscreen ? '还原' : '最大化';
    maxMin.innerHTML = '<i class=' + (el.fullscreen ? '"el-icon-crop"' : '"el-icon-full-screen"') + ' onMouseOver="this.style.color=\'#000\'" onMouseOut="this.style.color=\'inherit\'"></i>';
    dialogHeaderEl.insertBefore(maxMin, dialogHeaderEl.childNodes[1]);
    let moveDown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
      } else {
        styL = +sty.left.replace(/\px/g, '');
        styT = +sty.top.replace(/\px/g, '');
      }
      ;
      const bodyWidth = document.body.clientWidth
      const bodyHeight = document.body.clientHeight // 获取屏幕高度
      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX;
        const t = e.clientY - disY;
        
        // 限制不让拖出屏幕 *****
        if(e.clientY<20 || e.clientY > bodyHeight -100){
          return 
        }
        if(e.clientX<100 || e.clientX > bodyWidth -100){
          return 
        }
        // 移动当前元素
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;
        //将此时的位置传出去
        //binding.value({x:e.pageX,y:e.pageY})
      };

      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    }
    dialogHeaderEl.onmousedown = moveDown;
    let bodyHeight = 'auto';

    function setMaxMin() {
      if (el.fullscreen) {
        let i = maxMin.querySelector('.el-icon-crop');
        i.classList.remove('el-icon-crop');
        i.classList.add('el-icon-full-screen');
        maxMin.innerHTML = '<i class="el-icon-full-screen"></i>';
        maxMin.title = '最大化';
        dragDom.style.height = "auto";
        dragDom.style.width = nowWidth + 'px';
        dragDom.style.marginTop = nowMarginTop;
        dragDom.style.marginBottom = '50px';
        el.fullscreen = false;
        dialogHeaderEl.style.cursor = 'move';
        dialogHeaderEl.onmousedown = moveDown;
        console.log(bodyHeight)
        // dragDom.querySelector('.el-dialog__body').style.height = bodyHeight;
        dragDom.querySelector('.el-dialog__body').style.height = 'auto';
        dragDom.querySelector('.el-dialog__body').style.overflow = 'visible';
        hasSetBodyHight = false;
      } else {
        let i = maxMin.querySelector('.el-icon-full-screen');
        i.classList.remove('el-icon-full-screen');
        i.classList.add('el-icon-crop');
        maxMin.title = '还原';
        bodyHeight = dragDom.querySelector('.el-dialog__body').offsetHeight + 'px';
        nowHight = dragDom.clientHeight;
        nowWidth = dragDom.clientWidth;
        nowMarginTop = dragDom.style.marginTop;
        dragDom.style.left = 0;
        dragDom.style.top = 0;
        dragDom.style.height = "100VH";
        dragDom.style.width = "100VW";
        dragDom.style.marginTop = 0;
        dragDom.style.marginBottom = 0;
        el.fullscreen = true;
        dialogHeaderEl.style.cursor = 'initial';
        dialogHeaderEl.onmousedown = null;
        if (!hasSetBodyHight) {
          let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
          // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight+Number(30)) + 'px)';
          dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
          dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
          hasSetBodyHight = true;
        }
      }
      el.dispatchEvent(resizeEvent);
    }

    //点击放大缩小效果
    maxMin.onclick = setMaxMin;
    //双击头部效果
    dialogHeaderEl.ondblclick = setMaxMin;
    // //拉伸
    // let resizeEl = document.createElement("div");
    // dragDom.appendChild(resizeEl);
    // //在弹窗右下角加上一个10-10px的控制块
    // resizeEl.style.cursor = 'se-resize';
    // resizeEl.style.position = 'absolute';
    // resizeEl.style.height = '15px';
    // resizeEl.style.width = '15px';
    // resizeEl.style.right = '0px';
    // resizeEl.style.bottom = '0px';
    // //鼠标拉伸弹窗
    // resizeEl.onmousedown = (e) => {
    //   // 记录初始x位置
    //   const clientX = e.clientX;
    //   // 鼠标按下，计算当前元素距离可视区的距离
    //   const disX = e.clientX - resizeEl.offsetLeft;
    //   const disY = e.clientY - resizeEl.offsetTop;
    //   document.onmousemove = function (e) {
    //     e.preventDefault(); // 移动时禁用默认事件
    //     // 通过事件委托，计算移动的距离
    //     const x = e.clientX - disX + (e.clientX - clientX);//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
    //     const y = e.clientY - disY;
    //     //比较是否小于最小宽高
    //     dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';
    //     dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';
    //     if (!hasSetBodyHight) {
    //       let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
    //       // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
    //       dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
    //       dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
    //       hasSetBodyHight = true;
    //     }
    //   };
    //   //拉伸结束
    //   document.onmouseup = function (e) {
    //     document.onmousemove = null;
    //     document.onmouseup = null;
    //     el.dispatchEvent(resizeEvent);
    //   };
    // }

      //拉伸(右下方)
      let resizeEl=document.createElement("div");
      dragDom.appendChild(resizeEl); 
      //在弹窗右下角加上一个10-10px的控制块
      resizeEl.style.cursor = 'se-resize';
      resizeEl.style.position = 'absolute';
      resizeEl.style.height = '10px';
      resizeEl.style.width = '10px';
      resizeEl.style.right = '0px';
      resizeEl.style.bottom = '0px';
      resizeEl.style.zIndex = '99';
      //鼠标拉伸弹窗
      resizeEl.onmousedown = (e) => {
        // 记录初始x位置
        let clientX = e.clientX;
        // 鼠标按下，计算当前元素距离可视区的距离
        let disX = e.clientX - resizeEl.offsetLeft;
        let disY = e.clientY - resizeEl.offsetTop;
        document.onmousemove = function (e) {
          e.preventDefault(); // 移动时禁用默认事件
          
          // 通过事件委托，计算移动的距离
          let x = e.clientX - disX + (e.clientX - clientX);//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
          let y = e.clientY - disY;
          //比较是否小于最小宽高
          dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';
          dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';
          if (!hasSetBodyHight) {
            let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
            // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
            dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
            dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
            hasSetBodyHight = true;
          }
          };
        //拉伸结束
        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
        };
      }
  
      //拉伸(左下方)
      let resizeElLeft=document.createElement("div");
      dragDom.appendChild(resizeElLeft); 
      //在弹窗右下角加上一个10-10px的控制块
      resizeElLeft.style.cursor = 'sw-resize';
      resizeElLeft.style.position = 'absolute';
      resizeElLeft.style.height = '10px';
      resizeElLeft.style.width = '10px';
      resizeElLeft.style.left = '0px';
      resizeElLeft.style.bottom = '0px';
      resizeElLeft.style.zIndex = '99';
      //鼠标拉伸弹窗
      resizeElLeft.onmousedown = (e) => {
        // 记录初始x位置
        let clientX = e.clientX;
        // 鼠标按下，计算当前元素距离可视区的距离
  
        let disX = dragDom.clientWidth;  // 鼠标按下 记录元素的宽
  
        let disY = e.clientY - resizeElLeft.offsetTop;
        document.onmousemove = function (e) {
          e.preventDefault(); // 移动时禁用默认事件
          
          // 通过事件委托，计算移动的距离
          let x = disX + (clientX - e.clientX)*2;//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
          let y = e.clientY - disY;
          //比较是否小于最小宽高
          dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';
          dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';
          if (!hasSetBodyHight) {
            let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
            // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
            dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
            dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
            hasSetBodyHight = true;
          }
          };
        //拉伸结束
        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
          el.dispatchEvent(resizeEvent);
        };
      }
      
      //拉伸(右边)
      let resizeElR=document.createElement("div");
      dragDom.appendChild(resizeElR); 
      //在弹窗右下角加上一个10-10px的控制块
      resizeElR.style.cursor = 'w-resize';
      resizeElR.style.position = 'absolute';
      resizeElR.style.height = '100%';
      resizeElR.style.width = '10px';
      resizeElR.style.right = '0px';
      resizeElR.style.top = '0px';
      //鼠标拉伸弹窗
      resizeElR.onmousedown = (e) => {
        let elW = dragDom.clientWidth;
        let EloffsetLeft = dragDom.offsetLeft;
        // 记录初始x位置
        let clientX = e.clientX;
        document.onmousemove = function (e) {
          e.preventDefault(); // 移动时禁用默认事件
          //右侧鼠标拖拽位置
          if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {
              //往左拖拽
              if (clientX > e.clientX) {
                  if (dragDom.clientWidth < minWidth) {
                    console.log(111)
                  } else {
                      dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px';
                  }
              }
              //往右拖拽
              if (clientX < e.clientX) {
                  dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px';
              }
          }
          if (!hasSetBodyHight) {
            let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
            // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
            dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
            dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
            hasSetBodyHight = true;
          }
        };
        //拉伸结束
        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
          el.dispatchEvent(resizeEvent);
        };
      }
      
      //拉伸(左边)
      let resizeElL=document.createElement("div");
      dragDom.appendChild(resizeElL); 
      //在弹窗右下角加上一个10-10px的控制块
      resizeElL.style.cursor = 'w-resize';
      resizeElL.style.position = 'absolute';
      resizeElL.style.height = '100%';
      resizeElL.style.width = '10px';
      resizeElL.style.left = '0px';
      resizeElL.style.top = '0px';
      //鼠标拉伸弹窗
      resizeElL.onmousedown = (e) => {
        let elW = dragDom.clientWidth;
        let EloffsetLeft = dragDom.offsetLeft;
        // 记录初始x位置
        let clientX = e.clientX;
        document.onmousemove = function (e) {
          e.preventDefault(); // 移动时禁用默认事件
          //左侧鼠标拖拽位置
          if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
              //往左拖拽
              if (clientX > e.clientX) {
                  dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px';
              }
              //往右拖拽
              if (clientX < e.clientX) {
                  if (dragDom.clientWidth < minWidth) {
                    console.log(222)
                  } else {
                      dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px';
          
                  }
              }
          }
          if (!hasSetBodyHight) {
            let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
            // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
            dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
            dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
            hasSetBodyHight = true;
          }
        };
        //拉伸结束
        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
          el.dispatchEvent(resizeEvent);
        };
      }
      
      // 拉伸(下边)
      let resizeElB=document.createElement("div");
      dragDom.appendChild(resizeElB); 
      //在弹窗右下角加上一个10-10px的控制块
      resizeElB.style.cursor = 'n-resize';
      resizeElB.style.position = 'absolute';
      resizeElB.style.height = '10px';
      resizeElB.style.width = '100%';
      resizeElB.style.left = '0px';
      resizeElB.style.bottom = '0px';
      //鼠标拉伸弹窗
      resizeElB.onmousedown = (e) => {
       let EloffsetTop = dragDom.offsetTop;
       let ELscrollTop = el.scrollTop;
        let clientY = e.clientY;
        let elH = dragDom.clientHeight;
        document.onmousemove = function (e) {
          e.preventDefault(); // 移动时禁用默认事件
          //底部鼠标拖拽位置
          if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
              //往上拖拽
              if (clientY > e.clientY) {
                  if (dragDom.clientHeight < minHeight) {
                    console.log(333)
                  } else {
                      dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';
                  }
              }
              //往下拖拽
              if (clientY < e.clientY) {
                  dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';
              }
          }
          if (!hasSetBodyHight) {
            let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight;
            // dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)';
            dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - 142px)';
            dragDom.querySelector('.el-dialog__body').style.overflow = 'auto';
            hasSetBodyHight = true;
          }
        };
        //拉伸结束
        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
          el.dispatchEvent(resizeEvent);
        };
      }
  }
}


